[21 Key] Expand your desktop, 21 key mechanical numeric keypad is suitable for laptop users, banks, financial securities, business people or other keyboards without numeric parts. Small and light, it is convenient for you to take it with you. [Stepped Keycap] Ergonomic design, stepped keycap, easy to fit your hands and prevent fatigue. Spring type ergonomic design, care for your wrist. Suitable for PCs and desktop computers with for Windows 2000 / XP / Vista / 7/8 / 10, for Android, for Linux, for IOS. [Fadeless] Ultra durable, guarantees 50 million keystrokes, and the key characters will never fade. The ABS structure can stand the test of harsh conditions. [Mechanical] Mechanical blue switch, professional mechanical blue switch, with tactile and click sound, providing fast and accurate keystrokes. [No Driver Required] Plug and play, no driver required, USB Type C interface. Support NumLock, ESC, Tab, Delete, etc. [21 Key] Expand your desktop, 21 key mechanical numeric keypad is suitable for laptop users, banks, financial securities, business people or other keyboards without numeric parts. Small and light, it is convenient for you to take it with you. [Stepped Keycap] Ergonomic design, stepped keycap, easy to fit your hands and prevent fatigue. Spring type ergonomic design, care for your wrist. Suitable for PCs and desktop computers with for Windows 2000 / XP / Vista / 7/8 / 10, for Android, for Linux, for IOS. [Fadeless] Ultra durable, guarantees 50 million keystrokes, and the key characters will never fade. The ABS structure can stand the test of harsh conditions.